There's news with the upcoming DDR4 memory here: DDR4: What we can Expect | bit-tech.net
What i really like about this is 1 DIMM pero channel! thats awesome. Frequencies are also stated to start at 2.1Ghz up to 4.2Ghz
No world yet on latencies though.
What's not so hot is the increase in voltages. The article states that they're well acceptable for the performance increase though.
These aren't expected to hit mainstream until 2015.